Mercurial > hg > CbC > CbC_gcc
annotate gcc/config/host-hpux.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | a06113de4d67 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* HP-UX host-specific hook definitions. |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
2 Copyright (C) 2004, 2005, 2007, 2010 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it | |
| 7 under the terms of the GNU General Public License as published | |
| 8 by the Free Software Foundation; either version 3, or (at your | |
| 9 option) any later version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT | |
| 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
| 14 License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 #include "system.h" | |
| 22 #include "coretypes.h" | |
| 23 #include "hosthooks.h" | |
| 24 #include "hosthooks-def.h" | |
| 25 | |
| 26 static void *hpux_gt_pch_get_address (size_t, int); | |
| 27 static int hpux_gt_pch_use_address (void *, size_t, int, size_t); | |
| 28 | |
| 29 #undef HOST_HOOKS_GT_PCH_GET_ADDRESS | |
| 30 #define HOST_HOOKS_GT_PCH_GET_ADDRESS hpux_gt_pch_get_address | |
| 31 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS | |
| 32 #define HOST_HOOKS_GT_PCH_USE_ADDRESS hpux_gt_pch_use_address | |
| 33 | |
| 34 /* For various ports, try to guess a fixed spot in the vm space | |
| 35 that's probably free. */ | |
| 36 #if (defined(__hppa__) || defined(__ia64__)) && defined(__LP64__) | |
| 37 # define TRY_EMPTY_VM_SPACE 0x8000000000000000 | |
| 38 #elif defined(__hppa__) || defined(__ia64__) | |
| 39 # define TRY_EMPTY_VM_SPACE 0x60000000 | |
| 40 #else | |
| 41 # define TRY_EMPTY_VM_SPACE 0 | |
| 42 #endif | |
| 43 | |
| 44 /* Determine a location where we might be able to reliably allocate | |
| 45 SIZE bytes. FD is the PCH file, though we should return with the | |
| 46 file unmapped. */ | |
| 47 | |
| 48 static void * | |
| 49 hpux_gt_pch_get_address (size_t size, int fd) | |
| 50 { | |
| 51 void *addr; | |
| 52 | |
| 53 addr = mmap ((void *)TRY_EMPTY_VM_SPACE, size, PROT_READ | PROT_WRITE, | |
| 54 MAP_PRIVATE, fd, 0); | |
| 55 | |
| 56 /* If we failed the map, that means there's *no* free space. */ | |
| 57 if (addr == (void *) MAP_FAILED) | |
| 58 return NULL; | |
| 59 /* Unmap the area before returning. */ | |
| 60 munmap (addr, size); | |
| 61 | |
| 62 return addr; | |
| 63 } | |
| 64 | |
| 65 /* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at | |
| 66 mapping the data at BASE, -1 if we couldn't. | |
| 67 | |
| 68 It's not possibly to reliably mmap a file using MAP_PRIVATE to | |
| 69 a specific START address on either hpux or linux. First we see | |
| 70 if mmap with MAP_PRIVATE works. If it does, we are off to the | |
| 71 races. If it doesn't, we try an anonymous private mmap since the | |
| 72 kernel is more likely to honor the BASE address in anonymous maps. | |
| 73 We then copy the data to the anonymous private map. This assumes | |
| 74 of course that we don't need to change the data in the PCH file | |
| 75 after it is created. | |
| 76 | |
| 77 This approach obviously causes a performance penalty but there is | |
| 78 little else we can do given the current PCH implementation. */ | |
| 79 | |
| 80 static int | |
| 81 hpux_gt_pch_use_address (void *base, size_t size, int fd, size_t offset) | |
| 82 { | |
| 83 void *addr; | |
| 84 | |
| 85 /* We're called with size == 0 if we're not planning to load a PCH | |
| 86 file at all. This allows the hook to free any static space that | |
| 87 we might have allocated at link time. */ | |
| 88 if (size == 0) | |
| 89 return -1; | |
| 90 | |
| 91 /* Try to map the file with MAP_PRIVATE. */ | |
| 92 addr = mmap (base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset); | |
| 93 | |
| 94 if (addr == base) | |
| 95 return 1; | |
| 96 | |
| 97 if (addr != (void *) MAP_FAILED) | |
| 98 munmap (addr, size); | |
| 99 | |
| 100 /* Try to make an anonymous private mmap at the desired location. */ | |
| 101 addr = mmap (base, size, PROT_READ | PROT_WRITE, | |
| 102 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
| 103 | |
| 104 if (addr != base) | |
| 105 { | |
| 106 if (addr != (void *) MAP_FAILED) | |
| 107 munmap (addr, size); | |
| 108 return -1; | |
| 109 } | |
| 110 | |
| 111 if (lseek (fd, offset, SEEK_SET) == (off_t)-1) | |
| 112 return -1; | |
| 113 | |
| 114 while (size) | |
| 115 { | |
| 116 ssize_t nbytes; | |
| 117 | |
| 118 nbytes = read (fd, base, MIN (size, SSIZE_MAX)); | |
| 119 if (nbytes <= 0) | |
| 120 return -1; | |
| 121 base = (char *) base + nbytes; | |
| 122 size -= nbytes; | |
| 123 } | |
| 124 | |
| 125 return 1; | |
| 126 } | |
| 127 | |
| 128 | |
| 129 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; |